The synthesis and characterisation of europium terpyridine-N-oxide complexes

• Published in: Dalton transactions : an international journal of inorganic chemistry no. 16; p. 1630
• Main Authors: Amoroso, Angelo J, Burrows, Miles W, Haigh, Robert, Hatcher, Malcolm, Jones, Mark, Kynast, Ulrich, Malik, K M Abdul, Sendor, Dorota
• Format: Journal Article
• Language: English
• Published: England 01-01-2007
• Subjects: Chemistry, Physical - methods; Crystallography, X-Ray - methods; Europium - chemistry; Ligands; Luminescence; Magnetic Resonance Spectroscopy; Models, Chemical; Molecular Conformation; Molecular Structure; Organometallic Compounds - chemical synthesis; Organometallic Compounds - chemistry; Oxides - chemical synthesis; Oxides - chemistry; Pyridines - chemistry; Time Factors
• ISSN: 1477-9226
• DOI: 10.1039/b616758f

Europium complexes of a series of terpyridine-N-oxide ligands have been prepared and structurally characterised by crystallographic studies. While the addition of three equivalents of terpyridine-1-oxide or terpyridine-1,1'-bisoxide results in complexes with nine co-ordinate tricapped trigonal prismatic or monocapped square antiprismatic geometries, respectively, three equivalents of the terpyridine-1,1',1'-trisoxide yields an unexpected 8 co-ordinate geometry. Luminescence studies of the three complexes in acetonitrile show a typical europium emission spectra, dominated by the (5)D(0)-(7)F(2) transition. While no simple trend in the relative quantum yields could be ascertained, the terpyridine-1-oxide complex was observed to have the most intense luminescence for this set of complexes.